The duration of vulvar distension after vaginal delivery is: first, if there is a mild perineal laceration, the distension will get better after 2-3 days of giving medicated fumigation and applying erythromycin ointment. Secondly, if a woman has a serious perineal laceration during labor or the suture is not good, and there is a situation that the perineal laceration reopens on its own, the swelling and pain may take slightly longer, and it will take 7-10 days to get better. Women who experience post-partum bloating should be given potassium permanganate solution for fumigation or topical ointment when they are not experiencing bloating. Keep the vulva clean and hygienic, eat more crude fiber food, avoid constipation, pay attention to proper rest, which is conducive to the healing of the incision and can relieve the bloating pain.